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Table 2 Percentage of PDD dose points passing the three Γ-criteria. for varying histories at an initial beam energy of 5.40 MeV

From: Linac photon beam fine-tuning in PRIMO using the gamma-index analysis toolkit

Number of Histories (106)

Average Dose Uncertainty (%)

3 % /3mm (%)

2 % /2mm (%)

1 % /1mm (%)

2

50.2

100.0

91.2

47.1

5

27.3

90.6

56.2

19.2

10

15.5

75.0

31.8

11.4

25

9.6

90.3

54.2

14.6

100

5.1

99.4

72.4

18.5